如何返回日期中的CUMSUM天数- Python

from datetime import datetime, timedelta

def get_cumulative_days(date):
    start_date = datetime(year=2000, month=1, day=1)  # 设置起始日期
    target_date = datetime.strptime(date, '%Y-%m-%d')  # 将输入日期字符串转换为datetime对象
    delta = target_date - start_date  # 计算日期差值
    cumulative_days = delta.days + 1  # 计算CUMSUM天数
    return cumulative_days

date = '2022-12-31'
cumulative_days = get_cumulative_days(date)
print(cumulative_days)